"My question is about the pictures taken on mars. Why does NASA change the coloring throughout the pictures to make them look red?"
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Question
How do you detect planets around other stars?
There can find a comprehensive answer to your question on Wikipedia under planet detection or detection of extrasolar planets (http://en.wikipedia.org/wiki/Methods_of_detecting_extrasolar_planets). Thanks to Google and Wikipedia it is now quite easy to look up science topics like this. Briefly, most exoplanets have been detected so far from their gravitational effect on their star; we measure the motion of the star even though we cannot see the planet directly. The launch of the Kepler mission last March inaugurated a new technique of measuring the drop in light from a planetary transit, as a planet crosses in front of a star. For information on the current status of the Kepler survey for exoplanets, see (http://kepler.nasa.gov/).
David Morrison
NAI Senior Scientist
August 14, 2009
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